Editing Apple Personal LaserWriter 300 (section)

=== M2001 Controller Board Maintenance ===

The Personal LaserWriter 300 uses a custom ASIC controller without a microprocessor:

'''ASIC Controller Service:'''
# '''Visual inspection:'''
## Check for bulging capacitors (only 3 electrolytics)
## Look for burnt components near power input
## Verify ribbon cable connections
## Check for corrosion on edge connector

# '''Capacitor locations (M2001 board):'''
## C1: 47µF 16V near power input
## C2: 100µF 10V near ASIC
## C3: 47µF 16V near serial connector

# '''Cleaning procedure:'''
## Remove board from printer
## Clean edge connector with pencil eraser
## Apply DeoxIT to serial port pins
## Blow out dust with compressed air

# '''Compression chip verification:'''
## ASIC marked "Apple 343S0140" or similar
## No field repair possible
## Failure requires board replacement